Improvement in boiler-flue cleaners



J. AI'TOHISON & J. F. DOOLITTLE. Boiler-Flue Gleaner.

No. 217.570. Patented J u|y15, 1879.

WITNESSES v I I [I i M PETERS. PHOTO-LITMOGRAPNER, wAsmNGTDN. D C.

UN TED STATES PATENT. OFFICE.

JAMES AITOHISON AND J OHN F. DOOIJITTLE, OF CLEVELAND, OHIO.

IMPROVEMENT |N BOlLER-FLUE CLEANERS.

Specification forming part of Letters Patent No. 217,570, dated July 15, 1879; application filed May 26, 1879.

To all whom it may concern:

Be it known that we, J mvrns AITCHISON and J 0HNF.DO0LITTLE, ofCleveland, in the county of Ouyahoga and'in the State of Ohio, have invented certain new and useful Improvements in Boiler-Flue Cleaners; and do hereby declare that the followingis a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

The nature of our invention consists in the construction and arrangement of a device for cleaning boiler-fines by steam, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which our invention appertains to make and use the same, we will now proceed to describe its construction and operation, referring to the annexed drawings, in which- Figure l is a central longitudinal section of our machine. Fig. 2 is a side view, and Fig. 3 an end view of the inner cone thereof.

A represents a truncated cone of any suitable dimensions, formed on the inside with a tapered seat at a, and having hollow projection B, with exterior screw-threads for the attachment of a pipe to convey steam into the same.

On theseat a is placed an inside cone, O, fastened to the outside cone by screws 1) b, and so arranged as to admit of steam passing between them. The end of the inner cone projects beyond the outer cone in the shape of a semi-sphere, D, which is made hollow, and has an opening, E. In the exterior surface of the inner cone 0 is made a series of spiral grooves, 01 d, as shown in Figs. 2and 3. This deviceis inserted in the end of the flue to be cleaned and the steam turned on. The steam then passes between the two cones and is guided to the surface of the flue all around.

The spiral grooves 61 give a spiral motion to the steam, whereby the scale and other obstacles are removed with more force than by a direct jet of steam.

The semi-sphere D in front acts as a guide to enter the flue, and also as a protector to the machine where the steam leaves the flue-cleaner. The spiral motion of the steam may be imparted by other means than the cone.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. The semi-spherical cone D, formed on the 

